Process for chemically impregnating jute sacks, tent cloth, and the like



Patented Aug. 18, i931-- No Drawing. Application filed March 24, 1930,Serial Np. 438,629, and in Germany February 14, 1929.

UNITED STATES AR'IHIlR IBORRMANN, or neurone, GERMANY, AssIsNoa 'I'O.SIEGMUND KOCH, or

. neurone;

PATENT OFFICE GERMANY I rnociiss roa GEEMICALLY IMPREG ATINGL JU'iESACKS, TENT CLOTH, AND THE LIKE This.invention relates to a novelprocess for chemically impregnating fabrics, especially jute sacks, tentcloth and the like to renderthe same waterproof. The new process differsin an advantageous manner from the hitherto known processes of this kindnot only in its simplicity and cheapness, but also in the durability andresist ing capability of the fabrics treated against climatic andsimilar influences.

For impregnating such fabrics hitherto caoutchouc or balata were'dissolvedin' benzol or the like by hot method, the impregnated materialbeing subjected to a vulcanizationunder heat.

Contrary theretoan impregnating liquid is prepared, accordingto thenewprocess, by cold method from balata, in that balata is dissolved in amixture consisting of equal parts of carbonic disulphideandtI'lChlOl'G-r thyle'ne, to which solution-filling substances,

-such as zinc-white, wheat flour, asbestos powder or the like, areaddedin known manner.

The fabrics treated with this impregnat- 'ing liquid are immediatelyready for use through the treatment.

Fabrics impregnated without further treatment after the evaporation ofthe solvent. The fabrics are then absolutely waterproof and notsensitive to heat or cold, without their losing any of their originalsuppleness and pliability in this manner can withstand temperatures upto 100 (3., without their usefulness being in any way af 1 fected, sothat for example'jute sacks treat ed according to the process aresuitable in 'an excellent manner for usein the tropics.

The proportions of the quantities of the several constituents of theimpregnating A liquidcan naturally vary according to thespecial'purposes and requirements, however experiments have shown that,particularly for impregnating jute sacks, tent cloth andsimilar fabrics,the following composition is in most cases very suitable:

"parts' by weight of carbonic disulphide,

50-parts by weightof trichlorethylene 20 parts by weight of wheat Hour20 parts. by weight of zinc-white or 40 parts by weight of asbestospowder and. i 10 parts by weight of balata. In preparing thecomposition,-the balata is dissolved at an ordinary temperature in amixture of carbonic disulphide and trichlorethylene. After dissolvingcompletely, the filling substances, wheat flour and zincswhite, areadded, whereupon the whole is-again thoroughly mixed for about threehours and brought into a suitable reservoir, from which the solution isfed as required through pipe conduits or the like to the vessel to actas the'bath.- I

The jute sacks to be dipped into the bath are .preferably stretchedtightly-over plates chines.

The solvent used can be recovered almost entirely in knownmanner byevaporation, so that the new impregnating process is very cheap ascompared with other processes.

Thebalata mass is intimately combined with the filling substancesemployed in the finest uniform distribution in the impregnated fabricand adheres absolutely tightly to the fibres, so that the fabrics have avery great durability without becoming stiff or brittle.

The fabrics treated according to the new process are absolutelyimpervious to mois-.

ture, because the impregnating liquid is not only itselfabsolutely-sterile but any mildew or similar germs present in the fabricare positively destroyed.

Tent cloth and other piece fabrics are treated in a similar manners 1.The herein described process of waterproofing jute, tent clothand otherfabrics,

which consists in dipping the fabric in a stretched state in animpregnating solution formed by dissolvin balat-a in a solventmixture'including a fidler for about 1% minutes, removing the fabricfrom the solution I and permitting any excess deposit to draintherefrom, and thereafter evaporating the solvent of the solution fromthe mixture remaining with the fabric.

2. The herein described process of waterproofing jute, tent cloth andother fabrics, which consists in saturating the fabric in a stretchedcondition with an impregnating solution formed by dissolving 10 units of"balata in a. solvent mixture of '50 units ofcarbon disulfid and50-units trichlorethylene and adding a filler, in draining the fabric topermit excess solution to be dislodged thererom, and subjecting thefabric to an exhauster for vaporizmg the 'solvent' of the solution.

In witness whereof, I subscribe my signature. ARTHUR BORRMANN. Y

